16

I'm trying to hide the client IP from emails sent from postfix.

here is an example of what I mean:

Received: from mail.[removed].com (adsl-75-37-61-254.dsl.frs2ca.sbcglobal.net [75.37.61.254])
    (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits))
    (No client certificate requested)
    by mail.[removed].com (Postfix) with ESMTP id D50C7BF185DD
    for <[removed]@gmail.com>; Thu,  2 Aug 2012 16:14:21 +0900 (JST)
Date: Thu, 02 Aug 2012 07:14:08 +0000

Notice this line (adsl-75-37-61-254.dsl.frs2ca.sbcglobal.net [75.37.61.254])

I want to remove that line from the email.

I've tried doing this:

/etc/postfix/main.cf :

smtp_header_checks = regexp:/etc/postfix/smtp_header_checks

smtp_header_checks :

/^((.*) [(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])])/    IGNORE

But my IP address is still inside of the received part of the email. If I send email off the smtp server locally the IP address becomes localhost.localdomain [127.0.0.1]

How can I remove client IPs from the header?

12

In main.cf:

smtp_header_checks = pcre:/etc/postfix/smtp_header_checks

In dynamicmaps.cf:

# Use your real path to dict_pcre.so, below
pcre    /usr/lib/postfix/dict_pcre.so           dict_pcre_open

You should put this in your /etc/postfix/smtp_header_checks:

/^Received: .*/     IGNORE
/^X-Originating-IP:/    IGNORE

Then run

# /etc/init.d/postfix reload
  • My ip address is still displayed. I appreciate the efforts. – Kyle Aug 2 '12 at 7:43
  • It is not necessary to have postfix-pcre. Regexp works the same way. – Kyle Aug 2 '12 at 7:45
  • Alright. I have made sure pcre was install on the system. I have changed regexp:/etc/postfix/smtp_header_checks to pcre:/.... I have then restarted postfix and monitored maillog for any errors. No errors were displayed. The email still displays my ip. XD Thanks for the efforts, Mike. – Kyle Aug 2 '12 at 7:51
  • Hmm... I get an error but I found this irbs.net/internet/postfix/0404/1097.html I tested the regex with this postfix.org/pcre_table.5.html using argument: postmap -q "Received: from mail.[removed].com (adsl-75-37-61-254.dsl.frs2ca.sbcglobal.net [75.37.61.254])" pcre:/etc/postfix/smtp_header_checks and the output was IGNORE so it is working. However it is not making changes in the email... Is the field inside main.cf wrong? – Kyle Aug 2 '12 at 7:57
  • 1
    Shit man. I just wasted your time. It's my fault in the very beginning. smtp_header_checks was supposed to be header_checks... It works now. I'm so sorry I wasted your time. I appreciate your efforts. Thank you. pcre also works too. I'm on centos. Thanks again, bro. – Kyle Aug 2 '12 at 8:03
4

Open /etc/postfix/master.cf and find:

cleanup unix n - n - 0 cleanup

Add below those line and become:

cleanup unix n - n - 0 cleanup -o header_checks=pcre:/etc/postfix/header_checks

Edit /etc/postfix/header_checks and add below codes:

/^Received:/ IGNORE

Now restart postfix. Let say on CentOS:

service postfix restart

  • Unfortunately, this will also strip the Received header on incoming mail. – Keelan May 5 at 17:36
-1

use this:

/^Received: from .*127.0.0.1**/ IGNORE

only use single * in both ends

  • Or more like it? /^Received: from .*127\.0\.0\.1.*/ IGNORE – Jack B. Feb 27 at 20:38

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